Method for supporting a discontinuous transmission mode in a base station in a mobile communication system

Abstract

Disclosed is a method for transmitting a signal from a base station transceiver system (BTS) to a base station controller (BSC) when there is no data transmitted from a mobile station while in discontinuous transmission (DTX) mode, in a mobile communication system. The mobile communication system includes a mobile station for transmitting and receiving data in a predetermined period, a base station transceiver system and a base station controller for controlling the base station transceiver system. Upon detection of the discontinuous transmission mode, it is determined what type of frame was last transmitted from the mobile station, and the present power control information is set according to the type of frame. If it is a null frame, the base station transceiver system sets previous power control information that the base station transceiver system has used for power control of the mobile station before detection of discontinuous transmission mode, to present power control information. Thereafter, the base station transceiver system transmits a reverse message including the present power control information to the base station controller over a dedicated control channel. If there is data being transmitted between the mobile station and the base station transceiver system at the time where the discontinuous transmission mode is detected, the previous power control information is set to the present power control information.

What is claimed is:  
     
       1. A method for transmitting a signal from a base station transceiver system (BTS) to a base station controller (BSC) when there is no data transmitted from a mobile station while in discontinuous transmission (DTX) mode, in a mobile communication system, said mobile communication system including said mobile station for transmitting and receiving data in a synchronous mode, said base station transceiver system and said base station controller for controlling said base station transceiver system, the method comprising the steps of: 
       detecting discontinuous transmission (DTX) mode;  
       setting previous power control information to present power control information if discontinuous transmission mode is detected, said previous power control information having been used for power control of the mobile station before detection of discontinuous transmission mode; and  
       transmitting a reverse message including the present power control information to the base station controller over a dedicated channel.  
     
     
       2. The method as claimed in  claim 1 , wherein, if there is data being transmitted between the mobile station and the base station transceiver system at the time when the discontinuous transmission mode is detected, the previous power control information is set to the present power control information. 
     
     
       3. A method for transmitting a signal from a base station controller (BSC) to a base station transceiver system (BTS) when there is no data transmitted from a mobile station while in discontinuous transmission (DTX) mode, in a mobile communication system, said mobile communication system including said mobile station for transmitting and receiving data in a predetermined period, said base station transceiver system and said base station controller for controlling said base station transceiver system, the method comprising the steps of: 
       detecting discontinuous transmission mode;  
       detecting a type of a frame included in a reverse message last received from the base station transceiver system if discontinuous transmission mode is detected;  
       setting previous power control information for controlling transmission power of the mobile station, included in the reverse message, to present power control information for controlling transmission power of the mobile station, if a null or idle frame is included in the reverse message while in discontinuous transmission mode; and  
       transmitting a forward message including the present power control information to the base station controller over a dedicated control channel.  
     
     
       4. The method as claimed in  claim 3 , further comprising the step of: 
       setting the present power control information to increase transmission power of the mobile station, if an erasure frame is included in the reverse message while in discontinuous transmission mode.  
     
     
       5. The method as claimed in  claim 3 , further comprising the step of: 
       setting power control information included in the reverse message to the present power control information, when a data frame is included in the reverse message while in discontinuous transmission mode.